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DOI: 10.1007/s10965-013-0212-7

Cylindritic Structures Of Isotactic Polypropylene Molded By Sequential Co-injection Molding

G. Wang, Y. Zhou, Songjie Wang, J. Chen, X. Zhang, Sheng Lu
Published 2013 · Materials Science

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In this study, isotacitc polypropylene (iPP) samples were prepared by conventional injection molding (CIM) and sequential co-injection molding (SCIM), in which two kinds of polymer melt were injected into the mold cavity one after the other. The morphological structure of the samples was investigated by polarized light microscopy (PLM) and scanning electron microscopy (SEM). Results show that the structures of the samples prepared by CIM have a typical skin-core structure. This structure could be divided into three layers along the thickness direction of the samples: skin layer, transition region and core layer. However, the morphologies of the samples prepared by SCIM have a fascinating supermolecular structure that can not be roughly divided into three layers. A region of cylindritic structures, which is rare in CIM, is formed between the skin layer and the core layer of the second injected material. In particular, the cylindritic structures are more easily found when the melt temperature is relatively lower and the delay time is longer. The results were further interpreted based on the analysis and comparison of the thermo-mechanical history imposed on the melt during the CIM and SCIM processes.
This paper references
Numerical simulation and experimental studies of the co-injection molding process [C
S Chen (1993)
10.1016/J.POLYMER.2011.05.002
Shish–kebab-like cylindrulite structures resulted from periodical shear-induced crystallization of isotactic polypropylene
Q. Zhou (2011)
10.1002/FLD.1114
Numerical investigation of the flow front behaviour in the co‐injection moulding process
F. Ilinca (2006)
10.1023/A:1017970416968
The effect of the skin thickness and spherulite size on the mechanical properties of injection mouldings
J. Viana (2001)
10.1002/1097-4628(20001205)78:10<1751::AID-APP60>3.0.CO;2-U
Melting and crystallization behaviors of injection-molded polypropylene
M. Fujiyama (2000)
10.1016/J.POLYMER.2003.10.020
Shear induced shish–kebab structure in PP and its blends with LLDPE
Y. Wang (2004)
10.1016/S0032-3861(97)10147-1
α and β phases of isotactic polypropylene: a case of growth kinetics `phase reentrency' in polymer crystallization
B. Lotz (1998)
Simulation of co-injection and gasassisted injection molding [C
L Turng (1991)
10.1016/S0032-3861(02)00253-7
The thermomechanical environment and the microstructure of an injection moulded polypropylene copolymer
J. Viana (2002)
10.1002/PEN.22012
Co‐injection molding of immiscible polymers: Skin‐core structure and adhesion studies
Marta Gomes (2011)
10.1081/MB-120013097
INTERNAL STRUCTURE OF CO-INJECTION MOLDED PP/PP SPECIMEN
G. Karacs (2002)
10.1021/MA0358374
Distribution of shish-kebab structure of isotactic polypropylene under shear in the presence of nucleating agent
Peng-wei Zhu (2004)
10.1007/BF00296241
Direct evidence of row-nucleated cylindritic crystallization in glass fiber-reinforced polypropylene composites
J. Varga (1993)
10.1016/J.POLYMER.2005.06.034
FLOW-INDUCED SHISH KEBAB PRECURSOR STRUCTURES IN ENTANGLED POLYMER MELTS
R. Somani (2005)
10.1002/APP.1993.070501216
Injection molding of polypropylene: X‐ray investigation of the skin–core morphology
W. Wenig (1993)
10.1016/J.POLYMER.2011.06.004
Cylindritic structures of high-density polyethylene molded by multi-melt multi-injection molding
K. Zhang (2011)
10.1007/S10965-008-9259-2
β-Crystal formation of isotactic polypropylene induced by N, N’-dicyclohexylsuccinamide
Quliang Lu (2009)
10.1016/J.POLYMER.2003.12.001
Development of the skin layer in injection moulding: phenomenological model
J. Viana (2004)
10.1002/PEN.760201206
A basic experimental study of sandwich injection molding with sequential injection
S. S. Young (1980)
10.1002/POLB.22013
Morphological Evolution and Orientation Development of Stretched iPP Films: Influence of Draw Ratio
Y. Zhou (2010)
10.1002/PEN.11601
Crystallinity and microstructure in injection moldings of isotactic polypropylenes. Part 1: A new approach to modeling and model parameters
X. Guo (1999)
10.1016/0266-3538(95)00023-2
A quantitative comparison of morphology and fibre orientation in push-pull processed and conventional injection-moulded parts
H. Ludwig (1995)
10.1080/03602550802129676
Numerical Simulation of Crystallization Morphological Evolution Under Nonisothermal Conditions
Changyu Shen (2008)
10.1002/PEN.20852
Real-time diagnosis of co-injection molding using ultrasound
Chin-Chi Cheng (2007)
10.1016/J.POLYMERTESTING.2005.04.003
Effect of molding parameters on the properties of PP/PP sandwich injection moldings
T. Nagaoka (2005)
10.1007/s10965-013-0122-8
Shear-induced crystallization morphology and mechanical property of high density polyethylene in micro-injection molding
X. Lin (2013)
10.1016/J.POLYMER.2005.06.074
In situ optical microscope study of the shear-induced crystallization of isotactic polypropylene
Chenggui Zhang (2005)
10.1007/S10965-011-9620-8
Oriented re-crystallization of polypropylene through partial melting and its dramatic influence on mechanical properties
B. Na (2011)
10.1016/J.POLYMER.2006.05.028
Linear nucleation of polymers
D. Bassett (2006)
10.1002/PEN.11244
Co‐injection molding: Effect of processing on material distribution and mechanical properties of a sandwich molded plate
R. Seldén (2000)
10.1016/J.PROGPOLYMSCI.2005.09.001
Modeling of morphology evolution in the injection molding process of thermoplastic polymers
R. Pantani (2005)
10.1016/J.POLYMER.2011.03.017
New insight on the annealing induced microstructural changes and their roles in the toughening of β-form polypropylene
Hongwei Bai (2011)
10.1021/MA035932C
A Scanning Electron Microscopy Study on the Morphologies of Isotactic Polypropylene Induced by Its Own Fibers
H. Li (2004)
10.1016/J.MSEA.2011.05.030
Synergistic toughening of polypropylene random copolymer at low temperature: β-Modification and annealing
F. Luo (2011)
10.1016/S1359-835X(02)00007-6
Influence of push–pull injection moulding on fibres and matrix of fibre reinforced polypropylene
K. Waschitschek (2002)
10.1002/(SICI)1099-0488(199603)34:4<657::AID-POLB6>3.0.CO;2-N
Rules of supermolecular structure formation in sheared isotactic polypropylene melts
J. Varga (1996)
10.1063/1.2038807
Nucleation-controlled multiphase transitions.
A. Ziabicki (2005)
10.1016/S0032-3861(98)00472-8
Structural hierarchy developed in co-injection molded polystyrene/polypropylene parts
M. Kadota (1999)
10.1002/1521-3900(200208)185:1<105::AID-MASY105>3.0.CO;2-3
Orientation‐induced crystallization in isotactic polypropylene melt by shear deformation
R. Somani (2002)



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10.1016/J.ICHEATMASSTRANSFER.2018.07.003
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10.1002/PEN.24009
Numerical simulation of the sequential coinjection molding process based on level set method
Q. Liu (2015)
10.1002/CJCE.22394
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